事先声明，本文操作均使用 PG 数据库，保存到数据库的时间不带时区。
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If you are writing program by C programming language, you may need to care about how many memories to allocate, and when you should deallocate them. That is a heavy work for programmers, but at the same time it is very interesting. You will recognize that when defining a
float variable, how many memories we need to allocate? Why a function can modify extern variables by passing the pointer of them?